Communities living in coastal areas depend in a great extent on the fresh water resources exploited from aquifers which are usually in a natural hydrodynamic equilibrium with the sea water. The contamination of fresh water with marine salty water determines a significant increase in the aquifers electric conductivity, allowing an efficient application of resistivity methods in detecting and monitoring the marine intrusions. We present case studies from Romania (Costinesti and Vama Veche areas, southern Dobrogea) based on older vertical electric soundings (VES) and recent electric resistivity tomography (ERT) measurements, relevant for the detection and monitoring of coastal marine intrusions. The results of the geophysical investigations are mostly represented as apparent resistivity but also as inverted cross sections, both illustrating by means of resistivity anomalies the spatial development and evolution in time of the marine intrusions.


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